Tire pressure stabilizer



. R. SAGE TIRE PRESSURE STABILIZER April 5, 1948.

Filed March 14, 1946 me w www@ am@ MTM fw MW w Patented Apr. 6, 1 948 TIRE PRESSUIE STABILIZER Edwin R. Sage, Illes Angeles, Calif.

Application March 14, 1946, Serial'No. 654,257`

UNITED STATES PATENT OFFICE This invention relates to improvements in tire pressure stabilizers. i

The main objects of thisinventionare:

First, to provide a tire pressure stabilizer or means for maintaining substantially uniform pressure `within a tire under varying operating conditions' such as temperature variations, load conditions, and the like. I

Second, to provide a structure of thischaracter which may be readily embodied in wheels without materially varying the design thereof.

Third, to provide a structure having these advantages which is `comparatively economical and durable in its parts.

Objects relating to details and economiesof the invention will appear from the description to follow. The inventionis' dened and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which: I

Fig. 1 is afragmentary front or outer side elevation of a pneumatic Wheel structure embodyins' the invention. I

Fig. 2 isan enlarged view mainlyin section on a line corresponding to line 2-2 of Fig. 1.

Fig. 3 is an enlarged fragmentary view in section on line 3-3 of Fig. 1.

It is commonly recognized. that the life of pneumatic tires, particularly on trucks, is or may be greatly reduced by the stresses to which the tires areA subjected particularly in hot weather resulting from the tire becoming heated and the associated therewith. My improved wheel com` pris-es the rim 3 which is supported by the dished web 4 welded to the rim at 5 adjacentV the inner edge ofthe rim. The rim is of conventional type and has flanges 6 adapted to engage the beads 'I of the tire casing 8. The pneumatic or inner tube is indicated at 9. Theserim and tire parts are of conventional type. Y

The -web 4 has inner ange portions I receiving the screw bolts II by which the wheel is secured to the hub.

I provide a cylinder or expansion chamber comprising the inner and outer annular radially spaced side wall members I2 and I3 respectively, the inner ends of these members being welded e Claims. (ci. e-418)] A' throughout `totheouter'side vof the `web Il Vas` outer sideof the wheel. 1

The wall members I2 and- I3 have inwardly facing channels I5 at their outer ends, these channels being the resultxof bead-like formations I6 which have the further advantage of stiffening the wall members., 1

The annular 'closureplatell fits between the concentric wall members I2 and I3and is retained by thefsnap rings I8` engaged within the chan-` numeral 23. yPackings 2I and 22 rare provided for the' plunger or movable lwall member.

C The' coiled spring 23 is arranged between the plunger. and the closureA member, the springbeing preferably helically coiled andcone-shaped with its larger end inwardly so that the inner coil enf gages the plungerfat' the approximate center thereofi.` The outer `end ofthe spring is in thrust abutment engagement l withthe` closure plate; f

The conduit V2li is Vconnected to the expansion `chamber at the inner. end thereof, the otherfend of the conduit Abeing connected tothe tire stem 25. `A filler valve designated generally bythe numeral 26is provided. l

It will be noted that the rim projects beyond' the cylinder partsso thatlit serves as a guard therefor and thatityalso constitutes `a guard or' shield for the connections which are'main'ly disposed between the cuter cylinder wallmember I3 andtherim. l w

With the parts -thus arranged, substantially constant pressure: is maintainedrwithin the tirer inasmuch as the spring 23` is of such tension as tovyield orpermit' expansion `of the expansionV s chamber when the pressure within theV tire becomes excessive or.' exceeds a predetermined arno-unt.` Forfexample when the pressure rises within'thertre ,due to operatingcon hot pave.` ments, aircanriiow into the expansion chamber and when the pressure falls` as aresult of cooling of the tire the air can'ow from the expansion` chamber back into the tire 'and subject to the pressure of the spring for maintainingthe desired pressure in the tire. I j

I haveillustrated and described `my invention in an embodiment thereof; which I believe will enableithoseskilled irr the art to embody or adapt the invention-'as may be desired. 'I have not attemptedgeto 4illustrate or describe various modifications and adaptations as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired-for example to particular wheel structures.

Having thus'. des my claim as new an'd desire to secure" Patent is:

1. A wheel comprising a pneumatic tire and an inwardly dished supporting web attached thereto and having means for attachment to@l wheel hub, a pneumatic tire on saidS con*- centrically disposed radially vspace :d -anmillar.. eXj-r, pansion chamber side wall members weldedlat their inner ends to the outer side of the web and having facing annular channels at their outer ends, the inn-er sidewalli rnernberbeingl of! such diameter alsV to afford access tothe wheel attaching means, the outer side wall'r member being adjacent to but` spaced from. the: rim", the' outer edge of the rim prjetin'g;.substantially beyond the outer ends of thewall. rrleuibers'V to constitute a guard therefor; an annular closure plate disposed between.. said" wall .fmembers,- snap rings coacting ,withV said channels vfor" retain-ing said closure plate an annular plunger-like mbvable .expansion vchamber end-Wallriember' disposed between. saidside. wai-lmer'nbersanu prfvidedY with` packingsc'oacting therewith.; said web;

pressure ,within tbe tire exceeds' av predetermined.

amount; and; toi maintain substantially unifdrm predetermined'pressure within: the tire.-

. -2, .A wheel comprising a pneumatic tiize rim* and, an inward-lyl dished'supponting web attached' thereto and' having means; for attachment'. t'o a wheel'. hub. al pneumatic` tire on. sa'idrim.. con; centrically disposed .radial-ly spaced annular.. exparisiori Chamber side: w'allf" members xe'd ait their inner ends to the outer-sideoir thweb; the inner yside wall Amember being. of .such diameter as to` afford access :tei ther wheel: attaching: means, the outer side wall'memberbeing adjacent to;l but spacedv fromthe rim; anannular closure plate disposed b'e'tweensai'd wall members; an annular plunger-like movable expansion chamrb'er. end wall Ymer'nber disposed. between'. said: side. wall members andv provided with: packingsy coastingl therewith, sai dfweb, side: walllm'emb'ersr and.A movable end wall member coactin'g to, prov-ide an expansion. chamber, a! spring arrangedv between...

said movable end wall .member andl said closure member to impart yielding: thrust to. said. end wall member, .and a .conduit connectingzthe eirp'an'sion chamber to the tire,. the springbeing of such tension as to permit the. expansion. f the' expansion` chamber when. the pressurey withinA the tire exceeds a predetermined. amount and t'` maintain substantiallyv` unifrmA predetermined pressure within the tire.

3. A wheel comprising a pneumatic rim. and a supporting web',v a pneumaticv tire'onsaid rim, cc'ntrically di'spSd radially 'Spcedl hnular exp nsion chamber wall members secured at their in dsl to the web ahd oalctlhg therewith: to-

4 provide an annular cylinder, said wall members having facing annular channels at their outer ends, an annular closure plate disposed between said7 wall members, snaprings coacting with said channels for lretaining said closure plate, an annular plunger disposed in said cylinder and c0- actng therewith to provide an expansion chamber, a coiled spring arranged between said plunger; and'closure member to impart yielding thrust nto theplunger, and a conduit connecting the expansion chamber to the tire, the spring being YQt such tension as to permit expansion of the expansion chamber when the pressure of the tire exceeds a predetermined amount and to maintain substantiallyuniform predetermined pressure within the tire.

4. A wheel comprising a rim and a supporting web secured to said rib and extending radially inwardly therefrom, a pneumatic tire onl said rim; concentri'cally disposed radially spaced'annul'ar expansion chamber wall members secured at their inner ends to the web and coacting therewith to provide an annular cylinder, an annular plunger disposed in.v said cylinder and coasting therewith to provide an expansion chamber,` a

said plunger to impart yielding thrust thereto,

and a conduit connecting the expansion chamber to the tire, the spring being of such tension as to permit expansionl of the expansion' chaml ber when the pressure of the tire exceeds a' pre'xv determined amount and to maintain substantially uniform predetermined pressure within the tire.

5. A wheel comprising a pneumatic tire `rirn, and a supporting web, a pneumatic tire on. said rim,.the web'being connected to the rim adjacent theV inner edge thereof to providev a housing space. within the rim, an annular expansion cylinder mounted on .the web, the inner wall ofthe cylinder being of such diameter as to permit access to the hub housing means of the wheel, the outer wall of the cylinder being adjacent to bu'tfsp'acedV from the rim, the outer edge 0f therirn projecting beyond the o'uter ends of the cylinder walls, an annular closure platev for the outer end of the thrust to said plunger, and a conduit connecting the expansion chamber to thev tire disposed be# tween the outer wall of the cylinder and the rim and provided with a lling valve.

6. A Wheel comprising a pneumatic tire rim, and a supporting web, a pneumatic tire on said rim, the web being connected to the rim adjacent the inner edge thereof to provide ah'ousing space within the rim, an annular expansion cylinder mounted on the web, an annular plunger within. said cylinder, a spring arranged Within said cylinder walls to impart yielding thrust to s'ai'd plunger, and a conduit connecting the expansion chamber tothe tire. Y l

EDWIN R; SAGE.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES: PATENTS Number Y Name Date 1,016,558 Garrison Y Eeb.,6, 19112 1,0353207 Libby Allg.y 13, 1912 

